First of all, thank you for the replies. I reconnected the permanent power line with the filter on it and that seems to have eliminated the whine. However, I'm still having the 'power cutting out' problem, which I don't have if the permanent power line is disconnected. The Empeg player behaves normally if I use the regular AC adapter. I've also placed a voltmeter on the wires to see if there is a drop in current when the power thing happens, there isn't. Any ideas on this one?

Thanks!